CN108694922B - Common voltage driving method and device and display device - Google Patents
Common voltage driving method and device and display device Download PDFInfo
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- CN108694922B CN108694922B CN201810285971.3A CN201810285971A CN108694922B CN 108694922 B CN108694922 B CN 108694922B CN 201810285971 A CN201810285971 A CN 201810285971A CN 108694922 B CN108694922 B CN 108694922B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
Abstract
The invention discloses a public voltage driving method, which comprises the following steps: detecting the picture state of the current display picture according to a preset sampling period, and generating a control signal according to the picture state of the current display picture; and generating an alternating current public voltage or a direct current public voltage according to the control signal. The invention also provides a public voltage driving device and a display device, which are used for detecting the picture state of the current display picture according to the preset sampling period and generating the direct-current public voltage according to the control signal when the current display picture is a dynamic picture; when the current display picture is a static picture, the alternating current public voltage is generated according to the control signal to maintain the voltage balance of the anode and the cathode of the liquid crystal, so that the polarization state of the liquid crystal can not occur, and the afterimage phenomenon is improved.
Description
Technical Field
The invention belongs to the field of displays, and particularly relates to a common voltage driving method and device and a display device.
Background
Liquid Crystal Display (LCD) devices have the advantages of being light, thin, short, low in power consumption, low in heat, and the like, and are widely used in various types of Display devices, such as computers, mobile phones, and personal digital assistants, which are modern information devices.
The liquid crystal display device develops an image by an optical response generated by a driving voltage applied to liquid crystal molecules on the liquid crystal display device, that is, a gray scale response, which is a gradation of the driving voltage, and the development of the image takes a large part of a frame due to a limitation of a characteristic of a liquid crystal molecular material. Therefore, when the liquid crystal display device switches to the next screen after displaying a certain screen for a long time, when the viewer views the current screen, since the previous screen is not removed in time, the display image is overlapped with the current screen, thereby affecting the quality of the screen being viewed by the viewer, which is called an image sticking (ImageSticking) phenomenon.
One of the main causes of the afterimage of the liquid crystal display device is the direct current voltage induced by the ionic organic impurities mixed in the liquid crystal molecules in the liquid crystal display device. Under the induction of an electric field, ionic organic impurities in liquid crystal molecules are adsorbed on an array substrate or a color filter substrate of a liquid crystal display device, and the induced electric field generated by the liquid crystal molecules adversely affects the normal voltage at two ends of the liquid crystal molecules, so that the liquid crystal molecules cannot be normally oriented under the action of the electric field, and the accuracy of development is affected.
Fig. 1 is a schematic view of an array substrate of a related art liquid crystal display device, as shown in fig. 1, the array substrate includes scan lines 110 arranged in a horizontal direction of the substrate; data lines 120 arranged in a vertical direction of the substrate, the data lines being arranged to cross the scan lines vertically; the pixel unit 101 is formed by the scan line 110 and the data line 120 crossing each other, and the pixel unit 101 includes a pixel electrode 102 and a Thin Film Transistor 103 (TFT). The gates of the tfts 103 are electrically connected to the scan lines 110, the sources are electrically connected to the data lines 120, the drains are electrically connected to the pixel electrodes 102, each scan line is connected to the gate of each tft 103 in the corresponding row, and each data line is connected to the source of each tft 103 in the corresponding row.
When the liquid crystal display device works, the scanning lines 110 are used for respectively sending scanning signals to the thin film transistors 103 in the corresponding rows, and the thin film transistors 103 are controlled to be turned on or turned off line by line; when the tft 103 is turned on, a data signal on the data line 120 is applied to the pixel electrode 102 of the pixel unit 101 via the source and drain of the tft 103. The rotation of the liquid crystal molecules is controlled by an electric field formed by the pixel electrode 102 and the common electrode on the color filter substrate, thereby realizing image display.
In a liquid crystal display panel of a liquid crystal display device, there are three main voltages, which are a gate driving voltage, a source driving voltage, and a common electrode voltage. The gate driving voltage is used for controlling the gate of the thin film transistor in the pixel unit 101; the source driving voltage is used for driving the source of the thin film transistor in the pixel unit 101; the array substrate and the color filter substrate are both provided with common electrodes which are electrically connected, the common electrodes on the array substrate are used for forming storage capacitors with the pixel electrodes 102, and the common electrodes on the color filter substrate are used for forming liquid crystal capacitors with the pixel electrodes 102. The common electrode voltage is provided by a common electrode voltage module of the liquid crystal display device, and the common electrode voltage module provides a common electrode voltage for the liquid crystal display device when displaying a picture, wherein the common electrode voltage is represented as VCOM.
The common electrode voltage VCOM IS used to maintain the voltage balance between the positive electrode and the negative electrode of the liquid crystal, when the voltage balance between the positive electrode and the negative electrode of the liquid crystal IS lost, a bias voltage IS formed between each pixel electrode 102 and each common electrode, and a liquid crystal polarization phenomenon occurs in a region with a larger bias voltage, resulting in an Image Sticking (IS) phenomenon.
In the prior art, the common electrode voltage is a direct current common voltage (DCVCOM), and when the display screen is a dynamic screen, the liquid crystal voltage is changed, so that the voltage balance of the positive electrode and the negative electrode of the liquid crystal is maintained, and the polarization phenomenon cannot occur. When the display picture is a static picture, the liquid crystal voltage keeps the same voltage value all the time, and if the voltage of the common electrode is also fixed, the liquid crystal is polarized after long-time power supply, so that the afterimage phenomenon is caused. In order to improve the image sticking phenomenon, the DCVCOM is usually debugged as much as possible to maintain the voltage balance between the positive and negative electrodes of the liquid crystal, but the effect is not good. And under the condition of poor debugging condition, the problem of ghost shadow is not fundamentally solved by reducing the control of the specification card to process.
Disclosure of Invention
The invention aims to provide a common voltage driving method, a common voltage driving device and a display device.
According to a first aspect of the present invention, there is provided a common voltage driving method comprising: detecting the picture state of a current display picture according to a preset sampling period, and generating a control signal according to the picture state of the current display picture; and generating an alternating current public voltage or a direct current public voltage according to the control signal.
Preferably, the detecting the frame status of the current display frame according to the preset sampling period includes: reading the image information of the display picture in the current sampling period and the image information of the display picture in the previous sampling period according to the preset sampling period; comparing the image information of the display picture in the current sampling period with the image information of the display picture in the previous sampling period to obtain the image similarity of the display picture in the current sampling period and the display picture in the previous sampling period; when the image similarity is greater than the preset image similarity, the current display picture is a static picture; and when the image similarity is smaller than the preset image similarity, the current display picture is a dynamic picture.
Preferably, when the current display picture is a static picture, an alternating current public voltage is generated according to the control signal; and when the current display picture is a dynamic picture, generating a direct current common voltage according to the control signal.
Preferably, when the current display picture is a static picture, the control signal is at a low level; and when the current display picture is a dynamic picture, the control signal is at a high level.
According to a second aspect of the present invention, there is provided a common voltage driving apparatus comprising: the time schedule controller is used for detecting the picture state of the current display picture according to a preset sampling period and generating a control signal according to the picture state of the current display picture; and the public voltage generating module is used for generating alternating current public voltage or direct current public voltage according to the control signal.
Preferably, the timing controller includes: the reading unit is used for reading the image information of the display picture in the current sampling period and the image information of the display picture in the previous sampling period according to the preset sampling period; the image similarity unit is used for comparing the image information of the display picture in the current sampling period with the image information of the display picture in the previous sampling period to obtain the image similarity of the display picture in the current sampling period and the display picture in the previous sampling period; a display picture state detection unit, configured to, when the image similarity is greater than a preset image similarity, determine that the current display picture is a static picture; when the image similarity is smaller than the preset image similarity, the current display picture is a dynamic picture; and the control unit is used for generating the control signal according to the picture state of the current display picture.
Preferably, when the current display picture is a static picture, the common voltage generating module generates an alternating common voltage; and when the current display picture is a dynamic picture, the common voltage generation module generates a direct current common voltage.
Preferably, when the current display picture is a static picture, the control signal is at a low level; and when the current display picture is a dynamic picture, the control signal is at a high level.
Preferably, the common voltage generating module includes:
the first public voltage generating unit is used for generating alternating public voltage according to the control signal;
and the second common voltage generating unit is used for generating a direct current common voltage according to the control signal.
According to a third aspect of the present invention, there is provided a display device comprising the common voltage driving device as described above.
According to the public voltage driving method, the public voltage driving device and the display device, the picture state of the current display picture is detected according to the preset sampling period, and the direct-current public voltage is generated according to the control signal when the current display picture is a dynamic picture; when the current display picture is a static picture, the alternating current public voltage is generated according to the control signal to maintain the voltage balance of the anode and the cathode of the liquid crystal, so that the polarization state of the liquid crystal can not occur, and the afterimage phenomenon is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic view illustrating an array substrate of a related art liquid crystal display device;
fig. 2 is a flowchart illustrating a common voltage driving method according to an embodiment of the present invention;
fig. 3 shows a flowchart of step S10 provided according to an embodiment of the present invention;
FIG. 4 illustrates a waveform diagram of signals provided in accordance with an embodiment of the present invention;
fig. 5 is a schematic structural diagram illustrating a common voltage driving apparatus according to an embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
The present invention may be embodied in various forms, some examples of which are described below.
Fig. 2 is a flowchart illustrating a common voltage driving method according to an embodiment of the present invention. As shown in fig. 2, the common voltage driving method includes the following steps.
In step S10, the frame status of the current display frame is detected according to the predetermined sampling period, and a control signal is generated according to the frame status of the current display frame.
In this embodiment, the frame status of the current display frame is detected by the timing controller. The preset sampling period T is an image information sampling time preset according to actual use requirements. Specifically, every other preset sampling period T, the timing controller reads image information of a display picture from a system display card or an external host, compares the image information read in the current sampling period with the image information read in the previous sampling period to judge the picture state of the current display picture, and when the current display picture is a static picture, the control signal SW-Ctrl is at a low level; and when the current display picture is a dynamic picture, the control signal SW-Ctrl is at a high level.
As shown in fig. 3, step S10 specifically includes the following steps.
In step S101, image information of a current sample period display screen and image information of a previous sample period display screen are read according to a preset sample period.
In this embodiment, the timing controller reads and stores image information of a display screen of a current sample period and image information of a display screen of a previous sample period from the system graphics card or the external host according to a preset sample period T.
In step S102, the image information of the current sample period display screen is compared with the image information of the previous sample period display screen.
In this embodiment, the timing controller compares the image information of the current sample period display screen with the image information of the previous sample period display screen, and calculates the image similarity S between the current sample period display screen and the previous sample period display screen.
In step S103, when the image similarity S is greater than a preset image similarity S0, the current display screen is a static screen; and when the image similarity S is smaller than the preset image similarity S0, the current display picture is a dynamic picture.
In the present embodiment, the calculated image similarity S is compared with the preset image similarity S0, and if S > S0, the current display frame is a still frame, and the generated control signal SW-Ctrl is at a low level. If S < S0, the current display frame is a dynamic frame, and the generated control signal SW-Ctrl is high level.
In step S104, a control signal is generated according to the picture state of the currently displayed picture.
In the present embodiment, if the current frame is a still frame, the generated control signal SW-Ctrl is at a low level. If the current display frame is a dynamic frame, the generated control signal SW-Ctrl is at a high level.
In step S20, an ac common voltage or a dc common voltage is generated according to the control signal.
In this embodiment, as shown in fig. 4, when the current Display frame is a static Display frame (the Display frame status is represented by Display Data), the control signal SW-Ctrl is at a low level (L), and an ac common voltage ACVCOM is generated according to the control signal SW-Ctrl; when the current display frame is a dynamic frame, the control signal SW-Ctrl is at a high level (H), and a DC common voltage DCVCOM is generated according to the control signal SW-Ctrl. The final common voltage Vcom is formed by superimposing the dc common voltage DCVCOM and the ac common voltage ACVCOM according to the control signal.
The common voltage driving method of the display panel provided by the embodiment of the invention detects the picture state of the current display picture according to the preset sampling period, and generates the direct current common voltage according to the control signal when the current display picture is a dynamic picture; when the current display picture is a static picture, the alternating current public voltage is generated according to the control signal to maintain the voltage balance of the anode and the cathode of the liquid crystal, so that the polarization state of the liquid crystal can not occur, and the afterimage phenomenon is improved.
Fig. 5 is a schematic structural diagram illustrating a common voltage driving apparatus according to an embodiment of the present invention. As shown in fig. 5, the common voltage driving apparatus includes a timing controller 510 and a common voltage generating module 520.
The timing controller 510 is configured to detect a frame status of a current display frame according to a preset sampling period, and generate a control signal according to the frame status of the current display frame.
In the present embodiment, the timing controller 510 detects the frame status of the current display frame according to the preset sampling period T. The preset sampling period T is an image information sampling time preset according to actual use requirements. Specifically, every other preset sampling period T, the timing controller reads image information of a display picture in a current sampling period and image information of a display picture in a previous sampling period from a system display card or an external host, and compares the image information read in the current sampling period with the image information read in the previous sampling period to judge a picture state of the current display picture. When the current display picture is a static picture, the control signal SW-Ctrl is at a low level; and when the current display picture is a dynamic picture, the control signal SW-Ctrl is at a high level.
Specifically, the timing controller 510 includes a reading unit 511, an image similarity unit 512, a display screen state detection unit 513, and a control unit 514.
The reading unit 511 is configured to read image information of a display screen in a current sampling period and image information of a display screen in a previous sampling period according to a preset sampling period.
In this embodiment, the timing controller reads and stores image information of a display screen of a current sample period and image information of a display screen of a previous sample period from the system graphics card or the external host according to a preset sample period T.
The image similarity unit 512 compares the image information of the current sampling period display picture with the image information of the previous sampling period display picture to obtain the image similarity of the current sampling period display picture and the previous sampling period display picture.
The time sequence controller compares the image information of the display picture in the current sampling period with the image information of the display picture in the previous sampling period, and calculates the image similarity S between the display picture in the current sampling period and the display picture in the previous sampling period.
When the display frame state detection unit 513 calculates that the image similarity of the display frame in the current sampling period is greater than the preset image similarity, the current display frame is a static frame; when the display frame state detection unit 513 calculates that the image similarity of the display frame in the current sampling period is smaller than the preset image similarity, the current display frame is a dynamic frame.
In the present embodiment, the calculated image similarity S is compared with a preset image similarity S0, and if S > S0, the current display screen is a still screen, and if S < S0, the current display screen is a moving screen.
The control unit 514 is configured to generate a control signal according to a picture state of the currently displayed picture.
In the present embodiment, if the current frame is a still frame, the generated control signal SW-Ctrl is at a low level. If the current display frame is a dynamic frame, the generated control signal SW-Ctrl is at a high level.
The common voltage generating module 520 is used for generating an ac common voltage or a dc common voltage according to the control signal.
In this embodiment, when the current display frame is a static frame, the control signal SW-Ctrl is at a low level, and the common voltage generating module 520 generates the AC common voltage ACVCOM according to the control signal SW-Ctrl; when the current display frame is a dynamic frame, the control signal SW-Ctrl is at a high level, and the common voltage generating module 520 generates the DC common voltage DCVCOM according to the control signal SW-Ctrl.
The common voltage generating module 520 includes a first common voltage generating unit 521 and a second common voltage generating unit 522. The first common voltage generating unit 521 is configured to generate an ac common voltage according to a control signal; the second common voltage generating unit 522 is configured to generate a dc common voltage according to the control signal.
According to the common voltage driving method, the device and the display device of the display panel, provided by the embodiment of the invention, the picture state of the current display picture is detected according to the preset sampling period, and the direct current common voltage is generated according to the control signal when the current display picture is a dynamic picture; when the current display picture is a static picture, the alternating current public voltage is generated according to the control signal to maintain the voltage balance of the anode and the cathode of the liquid crystal, so that the polarization state of the liquid crystal can not occur, and the afterimage phenomenon is improved.
The invention also provides a display device, which comprises a display panel and the public voltage driving device, wherein the public voltage driving device provides alternating current public voltage or direct current public voltage for the display panel.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The scope of the invention should be determined from the following claims.
Claims (10)
1. A common voltage driving method, comprising:
detecting the picture state of a current display picture according to a preset sampling period, and generating a control signal according to the picture state of the current display picture;
generating an alternating current public voltage or a direct current public voltage according to the control signal;
when the current display picture is a static picture, generating an alternating current public voltage according to the control signal;
and when the current display picture is a dynamic picture, generating a direct current common voltage according to the control signal.
2. The method according to claim 1, wherein the detecting the frame status of the current display frame according to the predetermined sampling period comprises:
reading the image information of the display picture in the current sampling period and the image information of the display picture in the previous sampling period according to the preset sampling period;
comparing the image information of the display picture in the current sampling period with the image information of the display picture in the previous sampling period to obtain the image similarity of the display picture in the current sampling period and the display picture in the previous sampling period;
when the image similarity is greater than the preset image similarity, the current display picture is a static picture;
and when the image similarity is smaller than the preset image similarity, the current display picture is a dynamic picture.
3. The common voltage driving method according to claim 2,
when the current display picture is a static picture, generating an alternating current public voltage according to the control signal;
and when the current display picture is a dynamic picture, generating a direct current common voltage according to the control signal.
4. The common voltage driving method according to claim 3, wherein when the current display screen is a static screen, the control signal is at a low level;
and when the current display picture is a dynamic picture, the control signal is at a high level.
5. A common voltage driving apparatus, comprising:
the time schedule controller is used for detecting the picture state of the current display picture according to a preset sampling period and generating a control signal according to the picture state of the current display picture;
the public voltage generating module is used for generating alternating current public voltage or direct current public voltage according to the control signal;
when the current display picture is a static picture, the public voltage generating module generates an alternating public voltage according to the control signal;
and when the current display picture is a dynamic picture, the common voltage generating module generates a direct current common voltage according to the control signal.
6. The common voltage driving apparatus according to claim 5, wherein the timing controller comprises:
the reading unit is used for reading the image information of the display picture in the current sampling period and the image information of the display picture in the previous sampling period according to the preset sampling period;
the image similarity unit is used for comparing the image information of the display picture in the current sampling period with the image information of the display picture in the previous sampling period to obtain the image similarity of the display picture in the current sampling period and the display picture in the previous sampling period;
a display picture state detection unit, configured to, when the image similarity is greater than a preset image similarity, determine that the current display picture is a static picture; when the image similarity is smaller than the preset image similarity, the current display picture is a dynamic picture;
and the control unit is used for generating the control signal according to the picture state of the current display picture.
7. The common voltage driving apparatus according to claim 6, wherein when the current display screen is a static screen, the common voltage generating module generates an alternating common voltage;
and when the current display picture is a dynamic picture, the common voltage generation module generates a direct current common voltage.
8. The common voltage driving apparatus according to claim 7, wherein when the current display screen is a static screen, the control signal is at a low level;
and when the current display picture is a dynamic picture, the control signal is at a high level.
9. The common voltage driving apparatus according to claim 7, wherein the common voltage generating module comprises:
the first public voltage generating unit is used for generating alternating public voltage according to the control signal;
and the second common voltage generating unit is used for generating a direct current common voltage according to the control signal.
10. A display device comprising a display panel and the common voltage driving device according to any one of claims 5 to 9;
wherein the common voltage driving device supplies an alternating current common voltage or a direct current common voltage to the display panel.
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| CN111540330B (en) * | 2020-05-26 | 2022-03-08 | Tcl华星光电技术有限公司 | Liquid crystal driving circuit, liquid crystal driving method and liquid crystal display panel |
| CN113689815A (en) * | 2021-08-23 | 2021-11-23 | Tcl华星光电技术有限公司 | Drive circuit and display device |
| CN113948050A (en) * | 2021-10-25 | 2022-01-18 | 福州京东方光电科技有限公司 | Display screen voltage adjusting method, display and electronic equipment |
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